Runner block and mounting means therefor



May 12, 1931.

- .1. R. OSBORN 1,805,254

RUNNER BLOCK AND MOUNTING MEANS THEREFOR Filed Nov. 17, 1925 1/ I? CCXCEKCXCXCXC ZIEQCCLCXCEEZIZCZCEJ -%%Ka?%% KQIQX BKiIiXiXi a. Q i 5W5 i5 i il ti if ii? INVENTOR i i Z By Alzorncys,

Patented May 12, 1931 UNETED STATES JACOB B OSBOBN, OF DU BOIS,PENNSYLVANIA RUNNER BLOCK AND MGUNTING THEREFOR Application filedNovember This invention relates to improvements in runner blocks forgrinding machines and means for securing said blocks to a grinding head.

l5. Heretofore it has been the practice to unite two or more runnerblocks in a single unit by casting them as integral portions of a commonbase-plate or attaching bar.

It is an object of the present invention to cast the runner blocks asindividual units and detachably secure them to separate baseplates orattaching elements by means of which they may be mounted on the grindinghead. In the preferred form of the invention the attaching elements willbe in the form of bars of sizes suflicient to accommodate two or morerunner blocks.

The invention includes reinforcing means which assist the fasteningdevices, by which the blocks are secured'to the mounting elements', inpreventing relative rotation about axes perpendicular to their opposedcontacting surfaces.

Blocks made in accordance with this invention materially reduce thedegree of. distortion experienced in the casting of a plurality ofrunner blocks as an integral unit, thereby greatly reducing the amountof time which must be spent in working the faces of the blocks down to acommon "plane surface adapted for grinding. The invention also makes itpossible to construct the mounting elements of a material difierent fromthat used in the making of the runner blocks, whereby each part may beformed of the material most suitable for its intended purpose; and, ifdesired, the surfaces of the runner blocks and their attaching membersmay be machined to accurate sizes, thereby further eliminating theamount of time necessary to prepare the grinding head for grinding aftera new set of blocks has been mounted thereon.

In the drawings illustrating the preferred form of the invention;-

Figure 1 is a fragmentary bottom view of a grinding head with runnerblocks embodying the invention applied thereto.

Fig. 2 is a sectional View through a por- 17, 1925. Serial No. 69,629.

tion of the grinding head illustrated in Fig. 1. 1

Fig. 3 is a bottom View of an attaching element or mounting bar with tworunner blocks mounted thereon.

Fig. 4 is a side view of the mounting bar and runner blocks illustratedin Fig. 3, the third runner block being indicated in a posi- ]tionslightly detached from the mounting Fig. 5 is an end view of themounting bar and runner blocks illustrated in Figs. 3 and 4.

The invention in its preferred form as illustrated in theabove-described drawings comprises an attaching element or mounting bar10, to one surface of which may be secured one or more individual runnerblocks 11. These blocks may be of any suitable shape but in thepreferred form herein disclosed they are illustrated as being of oblongform having slightly inclined opposite side walls 12, conical end walls13, and parallel plane bases 14 and grinding surfaces 15.

The mounting element 10 may be of such size and form as to accommodateone or any desired number of the runner blocks 11. In Fig. 3 isillustrated an attaching element in the form of a rectangular bar of asize such as to accommodate three runner blocks spaced in end to endrelation therealong. These blocks may be securely but detachablyfastened to the attaching bar by means of suitable fastening devicesherein disclosed as screws 16 inserted through openings 17 in themounting bar and having threaded engagement wit-h tapped openings 18provided therefor in the bases of the runner blocks.

If desired, reinforcing means may be provided to aid the fasteningdevices 16 in preventing relative rotation between each block and themounting element about an axis perpendicular to their contacting faces.Such reinforcing elements may comprlse abutments extending from one ofsaid elements into engaging relation with portions f the other. In thepreferred form herein disclosed the reinforcing elements for each runnerblock comprise parallel abutments 19 projecting slightly from thesurface of the mounting element 10 and separated by a distance such asto receive and snugly embrace the opposite sides of the bases of therunner block, as clearly indicated in Figs. 3 and 5.

It will be apparent that the forms of the runner blocks may be varied aswell as the manner of forming the interlocking relation between thebases of the runner blocks and the reinforcing elements. It is ofimportance, however, that the engaging faces of the runner blocks andthe reinforcing elements should be so disposed as to prevent relativerotation between the runner blocks and the mountingelement about an axisperpendicular to their contacting faces.

Any appropriate means may be provided whereby the mounting element withits runner blocks attached thereto may 'be detachably secured to agrinding head. In the form herein disclosed, openings 20 are provided inportions of the attaching element which are not covered by the bases ofthe runner blocks,

said openings being adapted to receive screws '21 1) by means of whichthe attaching elementan d the runner blocks mounted thereon may beaffixed to the usual deck .22 of wood or other appropriate materialsecured in the usual manner to the under surface of a grinding head 23.

As heretofore "stated, the attaching elements may be varied in size andform to accommodate any desired number of runner blocks and theattaching elements and mounted runner blocks may be applied to the deckof the grinding head in accordancewith any desired arrangement, onearrangement being illustrated in Fig. 1.

It will be apparent from the foregoing description that runner blocksmade .in accordance with this invention may be accurately dimensionedand are free from the degree of distortion commonly experienced in thecast- .ing of a plurality of blocks and their supporting element as asingle unit. Further accuracy of' form may be attained, if desired,by'machining the working faces of the runner blocks and the attachingmember. This greater accuracy of form results in economy of time in thatthe grinding head to which a new set of blocks has been applied may bemuch more quickly worn down to a plane grinding surface preparatory tothe grinding of the material to be worked upon. When the runner blockshave been worn down as closely as practicable to the attaching element,the mounting element may be removed from the grinding head and theremaining base portions of the runner blocks may be detached from theattaching element by removing the screws 16, after which a new set ofrunner blocks may be applied to the attachmg element. This results in amarked degree of economy over the combined runner blocks and bases ofthe prior art of which it is necessary to scrap the mounting elements orattaching bars whenever a set of blocks becomes so worn as to have to bereplaced by new ones.

Since the mounting bars or attaching elements 10 do not have to bescrapped when the runner blocks are renewed but may be usedcontinuously, it becomes practicable to make them from material bestadapted for the intended purpose, even though at a somewhat increasedcost, and to machine them to accurate form. The increased cost of producing accurate mounting members would be more than made up in the savingof time in working the surfacesof the applied grinding blocks down to acommon level preparatory to a grinding operation.

The invention is not intended to be limited to the specific form hereinselected for purpose of illustration but should be regarded as includingvariations and modifications within the scope of the appended claims.

Vhat is claimed is:

1. The combination, with a grinding deck, of a plurality of grindingrunner blocks, a common mounting bar therefor, individual attachingmeans whereby each of said blocks may be detachably secured to theexposed face of said bar, and means whereby said bar and the attachedblocks may be detachably secured to said deck, said bar-attaching meansbeing readily accessible, for application and removal, from theblock-receiving surface of the deck.

2. The coi'nbination, with a grinding runn'cr block, of a mountingelement by which it may be secured to a grinding head, detach-- ableattaching moans passing through the base of said element into and.i'ecured within the base portion of said block, and openings in partsof said element not covered by said block to receive fastening deviceswhereby it may be detachably secured to a grinding head. I

3. The combination, with a grindingdeek, of a grinding runner block, amounting element therefor, means to prevent relative rotation betweensaid block and said element about an axis perpendicular to their opposedfaces, said means comprising abutments extending from one of said partsinto engaging relation with parts of the other, readily removableattaching means whereby said block and said element may be detachablysecured together in positions such as to render said abutm'e'ntseffective, and means whereby said, element, with said block securedthereto, may be detachably secured to said deck, said elementsecuringmeans being accessible, for application and removal, from theblock-receiving surface of the deck.

4. The combination, with a grinding runner block having a base ofnon-circular outline, of a mounting element therefor, means to preventrelative rotation between said block and said element about an axisperpendicular to their opposed faces, said means comprising abutmentsprojecting slightly from the blockreceiving surface of said element andso positioned as to snugly embrace oppositel disposed portions of thebase of said bloc detachable attaching means whereby said block may besecured to the portion of said element lying between said abutments, andmeans whereby said element, with said block mounted thereon, may bedetachably secured to the block-receiving surface of a grinding head,said element-securing means being accessible, for application andremoval, from the exposed surface of the element.

5. A mounting element whereby a grinding runner block may be secured toa grinding head, said element having abutments projecting slightly fromits block-receiving surface and so positioned as to snugly engageportions of the base of said block, when mounted, and prevent relativerotation about an axis perpendicular to said surface, openings in theportion of said element intended to be covered by the mounted block toreceive removable fastening devices whereby the block may bedetachablysecured thereto, and openings in parts of said element notintended to be covered by the mounted block to receive removablefastening devices whereby the element may be detachably secured to agrinding head.

In wltness whereof, I have hereunto signed my name.

JACOB R. OSBORN.

